<!DOCTYPE html>
<!--
@license
Copyright (C) 2016 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-diff-builder</title>

<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<script src="../../../bower_components/web-component-tester/browser.js"></script>
<link rel="import" href="../../../test/common-test-setup.html"/>
<script src="../../../scripts/util.js"></script>
<script src="../gr-diff/gr-diff-line.js"></script>
<script src="../gr-diff/gr-diff-group.js"></script>
<script src="../gr-diff-highlight/gr-annotation.js"></script>
<script src="gr-diff-builder.js"></script>

<link rel="import" href="../../shared/gr-rest-api-interface/mock-diff-response_test.html">
<link rel="import" href="gr-diff-builder.html">

<script>void(0);</script>

<test-fixture id="basic">
  <template>
    <gr-diff-builder>
      <table id="diffTable"></table>
    </gr-diff-builder>
  </template>
</test-fixture>

<test-fixture id="div-with-text">
  <template>
    <div>Lorem ipsum dolor sit amet, suspendisse inceptos vehicula</div>
  </template>
</test-fixture>

<test-fixture id="mock-diff">
  <template>
    <gr-diff-builder view-mode="SIDE_BY_SIDE">
      <table id="diffTable"></table>
    </gr-diff-builder>
  </template>
</test-fixture>

<script>
  suite('gr-diff-builder tests', () => {
    let prefs;
    let element;
    let builder;
    let sandbox;
    const LINE_FEED_HTML = '<span class="style-scope gr-diff br"></span>';

    setup(() => {
      sandbox = sinon.sandbox.create();
      element = fixture('basic');
      stub('gr-rest-api-interface', {
        getLoggedIn() { return Promise.resolve(false); },
        getProjectConfig() { return Promise.resolve({}); },
      });
      prefs = {
        line_length: 10,
        show_tabs: true,
        tab_size: 4,
      };
      builder = new GrDiffBuilder({content: []}, prefs);
    });

    teardown(() => { sandbox.restore(); });

    test('_createElement classStr applies all classes', () => {
      const node = builder._createElement('div', 'test classes');
      assert.isTrue(node.classList.contains('gr-diff'));
      assert.isTrue(node.classList.contains('test'));
      assert.isTrue(node.classList.contains('classes'));
    });

    test('context control buttons', () => {
      const section = {};
      const line = {contextGroup: {lines: []}};

      // Create 10 lines.
      for (let i = 0; i < 10; i++) {
        line.contextGroup.lines.push('lorem upsum');
      }

      // Does not include +10 buttons when there are fewer than 11 lines.
      let td = builder._createContextControl(section, line);
      let buttons = td.querySelectorAll('gr-button.showContext');

      assert.equal(buttons.length, 1);
      assert.equal(Polymer.dom(buttons[0]).textContent, 'Show 10 common lines');

      // Add another line.
      line.contextGroup.lines.push('lorem upsum');

      // Includes +10 buttons when there are at least 11 lines.
      td = builder._createContextControl(section, line);
      buttons = td.querySelectorAll('gr-button.showContext');

      assert.equal(buttons.length, 3);
      assert.equal(Polymer.dom(buttons[0]).textContent, '+10↑');
      assert.equal(Polymer.dom(buttons[1]).textContent, 'Show 11 common lines');
      assert.equal(Polymer.dom(buttons[2]).textContent, '+10↓');
    });

    test('newlines 1', () => {
      let text = 'abcdef';

      assert.equal(builder._formatText(text, 4, 10).innerHTML, text);
      text = 'a'.repeat(20);
      assert.equal(builder._formatText(text, 4, 10).innerHTML,
          'a'.repeat(10) +
          LINE_FEED_HTML +
          'a'.repeat(10));
    });

    test('newlines 2', () => {
      const text = '<span class="thumbsup">👍</span>';
      assert.equal(builder._formatText(text, 4, 10).innerHTML,
          '&lt;span clas' +
          LINE_FEED_HTML +
          's="thumbsu' +
          LINE_FEED_HTML +
          'p"&gt;👍&lt;/span' +
          LINE_FEED_HTML +
          '&gt;');
    });

    test('newlines 3', () => {
      const text = '01234\t56789';
      assert.equal(builder._formatText(text, 4, 10).innerHTML,
          '01234' + builder._getTabWrapper(3).outerHTML + '56' +
          LINE_FEED_HTML +
          '789');
    });

    test('newlines 4', () => {
      const text = '👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍';
      assert.equal(builder._formatText(text, 4, 20).innerHTML,
          '👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍' +
          LINE_FEED_HTML +
          '👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍' +
          LINE_FEED_HTML +
          '👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍');
    });


    test('line_length ignored if line_wrapping is true', () => {
      builder._prefs = {line_wrapping: true, tab_size: 4, line_length: 50};
      const text = 'a'.repeat(51);

      const line = {text, highlights: []};
      const result = builder._createTextEl(undefined, line).firstChild.innerHTML;
      assert.equal(result, text);
    });

    test('line_length applied if line_wrapping is false', () => {
      builder._prefs = {line_wrapping: false, tab_size: 4, line_length: 50};
      const text = 'a'.repeat(51);

      const line = {text, highlights: []};
      const expected = 'a'.repeat(50) + LINE_FEED_HTML + 'a';
      const result = builder._createTextEl(undefined, line).firstChild.innerHTML;
      assert.equal(result, expected);
    });

    test('_createTextEl linewrap with tabs', () => {
      const text = '\t'.repeat(7) + '!';
      const line = {text, highlights: []};
      const el = builder._createTextEl(undefined, line);
      assert.equal(el.innerText, text);
      // With line length 10 and tab size 2, there should be a line break
      // after every two tabs.
      const newlineEl = el.querySelector('.contentText > .br');
      assert.isOk(newlineEl);
      assert.equal(
          el.querySelector('.contentText .tab:nth-child(2)').nextSibling,
          newlineEl);
    });

    test('text length with tabs and unicode', () => {
      function expectTextLength(text, tabSize, expected) {
        // Formatting to |expected| columns should not introduce line breaks.
        const result = builder._formatText(text, tabSize, expected);
        assert.isNotOk(result.querySelector('.contentText > .br'),
            `  Expected the result of: \n` +
            `      _formatText(${text}', ${tabSize}, ${expected})\n` +
            `  to not contain a br. But the actual result HTML was:\n` +
            `      '${result.innerHTML}'\nwhereupon`);

        // Increasing the line limit should produce the same markup.
        assert.equal(builder._formatText(text, tabSize, Infinity).innerHTML,
            result.innerHTML);
        assert.equal(builder._formatText(text, tabSize, expected + 1).innerHTML,
            result.innerHTML);

        // Decreasing the line limit should introduce line breaks.
        if (expected > 0) {
          const tooSmall = builder._formatText(text, tabSize, expected - 1);
          assert.isOk(tooSmall.querySelector('.contentText > .br'),
              `  Expected the result of: \n` +
              `      _formatText(${text}', ${tabSize}, ${expected - 1})\n` +
              `  to contain a br. But the actual result HTML was:\n` +
              `      '${tooSmall.innerHTML}'\nwhereupon`);
        }
      }
      expectTextLength('12345', 4, 5);
      expectTextLength('\t\t12', 4, 10);
      expectTextLength('abc💢123', 4, 7);
      expectTextLength('abc\t', 8, 8);
      expectTextLength('abc\t\t', 10, 20);
      expectTextLength('', 10, 0);
      expectTextLength('', 10, 0);
      // 17 Thai combining chars.
      expectTextLength('ก้้้้้้้้้้้้้้้้', 4, 17);
      expectTextLength('abc\tde', 10, 12);
      expectTextLength('abc\tde\t', 10, 20);
      expectTextLength('\t\t\t\t\t', 20, 100);
    });

    test('tab wrapper insertion', () => {
      const html = 'abc\tdef';
      const tabSize = builder._prefs.tab_size;
      const wrapper = builder._getTabWrapper(tabSize - 3);
      assert.ok(wrapper);
      assert.equal(wrapper.innerText, '\t');
      assert.equal(
          builder._formatText(html, tabSize, Infinity).innerHTML,
          'abc' + wrapper.outerHTML + 'def');
    });

    test('tab wrapper style', () => {
      const pattern = new RegExp('^<span class="style-scope gr-diff tab" '
          + 'style="(?:-moz-)?tab-size: (\\d+);">\\t<\\/span>$');

      for (const size of [1, 3, 8, 55]) {
        const html = builder._getTabWrapper(size).outerHTML;
        expect(html).to.match(pattern);
        assert.equal(html.match(pattern)[1], size);
      }
    });

    test('_handlePreferenceError called with invalid preference', () => {
      sandbox.stub(element, '_handlePreferenceError');
      const prefs = {tab_size: 0};
      element._getDiffBuilder(element.diff, prefs);
      assert.isTrue(element._handlePreferenceError.lastCall
          .calledWithExactly('tab size'));
    });

    test('_handlePreferenceError triggers alert and javascript error', () => {
      const errorStub = sinon.stub();
      element.addEventListener('show-alert', errorStub);
      assert.throws(element._handlePreferenceError.bind(element, 'tab size'));
      assert.equal(errorStub.lastCall.args[0].detail.message,
          `The value of the 'tab size' user preference is invalid. ` +
        `Fix in diff preferences`);
    });

    suite('_isTotal', () => {
      test('is total for add', () => {
        const group = new GrDiffGroup(GrDiffGroup.Type.DELTA);
        for (let idx = 0; idx < 10; idx++) {
          group.addLine(new GrDiffLine(GrDiffLine.Type.ADD));
        }
        assert.isTrue(GrDiffBuilder.prototype._isTotal(group));
      });

      test('is total for remove', () => {
        const group = new GrDiffGroup(GrDiffGroup.Type.DELTA);
        for (let idx = 0; idx < 10; idx++) {
          group.addLine(new GrDiffLine(GrDiffLine.Type.REMOVE));
        }
        assert.isTrue(GrDiffBuilder.prototype._isTotal(group));
      });

      test('not total for empty', () => {
        const group = new GrDiffGroup(GrDiffGroup.Type.BOTH);
        assert.isFalse(GrDiffBuilder.prototype._isTotal(group));
      });

      test('not total for non-delta', () => {
        const group = new GrDiffGroup(GrDiffGroup.Type.DELTA);
        for (let idx = 0; idx < 10; idx++) {
          group.addLine(new GrDiffLine(GrDiffLine.Type.BOTH));
        }
        assert.isFalse(GrDiffBuilder.prototype._isTotal(group));
      });
    });

    suite('intraline differences', () => {
      let el;
      let str;
      let annotateElementSpy;
      let layer;
      const lineNumberEl = document.createElement('td');

      function slice(str, start, end) {
        return Array.from(str).slice(start, end).join('');
      }

      setup(() => {
        el = fixture('div-with-text');
        str = el.textContent;
        annotateElementSpy = sandbox.spy(GrAnnotation, 'annotateElement');
        layer = document.createElement('gr-diff-builder')
            ._createIntralineLayer();
      });

      test('annotate no highlights', () => {
        const line = {
          text: str,
          highlights: [],
        };

        layer.annotate(el, lineNumberEl, line);

        // The content is unchanged.
        assert.isFalse(annotateElementSpy.called);
        assert.equal(el.childNodes.length, 1);
        assert.instanceOf(el.childNodes[0], Text);
        assert.equal(str, el.childNodes[0].textContent);
      });

      test('annotate with highlights', () => {
        const line = {
          text: str,
          highlights: [
            {startIndex: 6, endIndex: 12},
            {startIndex: 18, endIndex: 22},
          ],
        };
        const str0 = slice(str, 0, 6);
        const str1 = slice(str, 6, 12);
        const str2 = slice(str, 12, 18);
        const str3 = slice(str, 18, 22);
        const str4 = slice(str, 22);

        layer.annotate(el, lineNumberEl, line);

        assert.isTrue(annotateElementSpy.called);
        assert.equal(el.childNodes.length, 5);

        assert.instanceOf(el.childNodes[0], Text);
        assert.equal(el.childNodes[0].textContent, str0);

        assert.notInstanceOf(el.childNodes[1], Text);
        assert.equal(el.childNodes[1].textContent, str1);

        assert.instanceOf(el.childNodes[2], Text);
        assert.equal(el.childNodes[2].textContent, str2);

        assert.notInstanceOf(el.childNodes[3], Text);
        assert.equal(el.childNodes[3].textContent, str3);

        assert.instanceOf(el.childNodes[4], Text);
        assert.equal(el.childNodes[4].textContent, str4);
      });

      test('annotate without endIndex', () => {
        const line = {
          text: str,
          highlights: [
            {startIndex: 28},
          ],
        };

        const str0 = slice(str, 0, 28);
        const str1 = slice(str, 28);

        layer.annotate(el, lineNumberEl, line);

        assert.isTrue(annotateElementSpy.called);
        assert.equal(el.childNodes.length, 2);

        assert.instanceOf(el.childNodes[0], Text);
        assert.equal(el.childNodes[0].textContent, str0);

        assert.notInstanceOf(el.childNodes[1], Text);
        assert.equal(el.childNodes[1].textContent, str1);
      });

      test('annotate ignores empty highlights', () => {
        const line = {
          text: str,
          highlights: [
            {startIndex: 28, endIndex: 28},
          ],
        };

        layer.annotate(el, lineNumberEl, line);

        assert.isFalse(annotateElementSpy.called);
        assert.equal(el.childNodes.length, 1);
      });

      test('annotate handles unicode', () => {
        // Put some unicode into the string:
        str = str.replace(/\s/g, '💢');
        el.textContent = str;
        const line = {
          text: str,
          highlights: [
            {startIndex: 6, endIndex: 12},
          ],
        };

        const str0 = slice(str, 0, 6);
        const str1 = slice(str, 6, 12);
        const str2 = slice(str, 12);

        layer.annotate(el, lineNumberEl, line);

        assert.isTrue(annotateElementSpy.called);
        assert.equal(el.childNodes.length, 3);

        assert.instanceOf(el.childNodes[0], Text);
        assert.equal(el.childNodes[0].textContent, str0);

        assert.notInstanceOf(el.childNodes[1], Text);
        assert.equal(el.childNodes[1].textContent, str1);

        assert.instanceOf(el.childNodes[2], Text);
        assert.equal(el.childNodes[2].textContent, str2);
      });

      test('annotate handles unicode w/o endIndex', () => {
        // Put some unicode into the string:
        str = str.replace(/\s/g, '💢');
        el.textContent = str;

        const line = {
          text: str,
          highlights: [
            {startIndex: 6},
          ],
        };

        const str0 = slice(str, 0, 6);
        const str1 = slice(str, 6);

        layer.annotate(el, lineNumberEl, line);

        assert.isTrue(annotateElementSpy.called);
        assert.equal(el.childNodes.length, 2);

        assert.instanceOf(el.childNodes[0], Text);
        assert.equal(el.childNodes[0].textContent, str0);

        assert.notInstanceOf(el.childNodes[1], Text);
        assert.equal(el.childNodes[1].textContent, str1);
      });
    });

    suite('tab indicators', () => {
      let element;
      let layer;
      const lineNumberEl = document.createElement('td');

      setup(() => {
        element = fixture('basic');
        element._showTabs = true;
        layer = element._createTabIndicatorLayer();
      });

      test('does nothing with empty line', () => {
        const line = {text: ''};
        const el = document.createElement('div');
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');

        layer.annotate(el, lineNumberEl, line);

        assert.isFalse(annotateElementStub.called);
      });

      test('does nothing with no tabs', () => {
        const str = 'lorem ipsum no tabs';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');

        layer.annotate(el, lineNumberEl, line);

        assert.isFalse(annotateElementStub.called);
      });

      test('annotates tab at beginning', () => {
        const str = '\tlorem upsum';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');

        layer.annotate(el, lineNumberEl, line);

        assert.equal(annotateElementStub.callCount, 1);
        const args = annotateElementStub.getCalls()[0].args;
        assert.equal(args[0], el);
        assert.equal(args[1], 0, 'offset of tab indicator');
        assert.equal(args[2], 1, 'length of tab indicator');
        assert.include(args[3], 'tab-indicator');
      });

      test('does not annotate when disabled', () => {
        element._showTabs = false;

        const str = '\tlorem upsum';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');

        layer.annotate(el, lineNumberEl, line);

        assert.isFalse(annotateElementStub.called);
      });

      test('annotates multiple in beginning', () => {
        const str = '\t\tlorem upsum';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');

        layer.annotate(el, lineNumberEl, line);

        assert.equal(annotateElementStub.callCount, 2);

        let args = annotateElementStub.getCalls()[0].args;
        assert.equal(args[0], el);
        assert.equal(args[1], 0, 'offset of tab indicator');
        assert.equal(args[2], 1, 'length of tab indicator');
        assert.include(args[3], 'tab-indicator');

        args = annotateElementStub.getCalls()[1].args;
        assert.equal(args[0], el);
        assert.equal(args[1], 1, 'offset of tab indicator');
        assert.equal(args[2], 1, 'length of tab indicator');
        assert.include(args[3], 'tab-indicator');
      });

      test('annotates intermediate tabs', () => {
        const str = 'lorem\tupsum';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');

        layer.annotate(el, lineNumberEl, line);

        assert.equal(annotateElementStub.callCount, 1);
        const args = annotateElementStub.getCalls()[0].args;
        assert.equal(args[0], el);
        assert.equal(args[1], 5, 'offset of tab indicator');
        assert.equal(args[2], 1, 'length of tab indicator');
        assert.include(args[3], 'tab-indicator');
      });
    });

    suite('layers from plugins', () => {
      let element;
      let initialLayersCount;

      setup(() => {
        element = fixture('basic');
        element._showTrailingWhitespace = true;
        element._setupAnnotationLayers();
        initialLayersCount = element._layers.length;
      });

      test('no plugin layers', () => {
        const getDiffLayersStub = sinon.stub(element.$.jsAPI, 'getDiffLayers')
                                       .returns([]);
        element._setupAnnotationLayers();
        assert.isTrue(getDiffLayersStub.called);
        assert.equal(element._layers.length, initialLayersCount);
      });

      test('with plugin layers', () => {
        const getDiffLayersStub = sinon.stub(element.$.jsAPI, 'getDiffLayers')
                                       .returns([{}, {}]);
        element._setupAnnotationLayers();
        assert.isTrue(getDiffLayersStub.called);
        assert.equal(element._layers.length, initialLayersCount + 2);
      });
    });

    suite('trailing whitespace', () => {
      let element;
      let layer;
      const lineNumberEl = document.createElement('td');

      setup(() => {
        element = fixture('basic');
        element._showTrailingWhitespace = true;
        layer = element._createTrailingWhitespaceLayer();
      });

      test('does nothing with empty line', () => {
        const line = {text: ''};
        const el = document.createElement('div');
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');
        layer.annotate(el, lineNumberEl, line);
        assert.isFalse(annotateElementStub.called);
      });

      test('does nothing with no trailing whitespace', () => {
        const str = 'lorem ipsum blah blah';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');
        layer.annotate(el, lineNumberEl, line);
        assert.isFalse(annotateElementStub.called);
      });

      test('annotates trailing spaces', () => {
        const str = 'lorem ipsum   ';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');
        layer.annotate(el, lineNumberEl, line);
        assert.isTrue(annotateElementStub.called);
        assert.equal(annotateElementStub.lastCall.args[1], 11);
        assert.equal(annotateElementStub.lastCall.args[2], 3);
      });

      test('annotates trailing tabs', () => {
        const str = 'lorem ipsum\t\t\t';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');
        layer.annotate(el, lineNumberEl, line);
        assert.isTrue(annotateElementStub.called);
        assert.equal(annotateElementStub.lastCall.args[1], 11);
        assert.equal(annotateElementStub.lastCall.args[2], 3);
      });

      test('annotates mixed trailing whitespace', () => {
        const str = 'lorem ipsum\t \t';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');
        layer.annotate(el, lineNumberEl, line);
        assert.isTrue(annotateElementStub.called);
        assert.equal(annotateElementStub.lastCall.args[1], 11);
        assert.equal(annotateElementStub.lastCall.args[2], 3);
      });

      test('unicode preceding trailing whitespace', () => {
        const str = '💢\t';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');
        layer.annotate(el, lineNumberEl, line);
        assert.isTrue(annotateElementStub.called);
        assert.equal(annotateElementStub.lastCall.args[1], 1);
        assert.equal(annotateElementStub.lastCall.args[2], 1);
      });

      test('does not annotate when disabled', () => {
        element._showTrailingWhitespace = false;
        const str = 'lorem upsum\t \t ';
        const line = {text: str};
        const el = document.createElement('div');
        el.textContent = str;
        const annotateElementStub =
            sandbox.stub(GrAnnotation, 'annotateElement');
        layer.annotate(el, lineNumberEl, line);
        assert.isFalse(annotateElementStub.called);
      });
    });

    suite('rendering text, images and binary files', () => {
      let processStub;
      let keyLocations;
      let prefs;
      let content;

      setup(() => {
        element = fixture('basic');
        element.viewMode = 'SIDE_BY_SIDE';
        processStub = sandbox.stub(element.$.processor, 'process')
            .returns(Promise.resolve());
        sandbox.stub(element, '_anyLineTooLong').returns(true);
        keyLocations = {left: {}, right: {}};
        prefs = {
          line_length: 10,
          show_tabs: true,
          tab_size: 4,
          context: -1,
          syntax_highlighting: true,
        };
        content = [{
          a: ['all work and no play make andybons a dull boy'],
          b: ['elgoog elgoog elgoog'],
        }, {
          ab: [
            'Non eram nescius, Brute, cum, quae summis ingeniis ',
            'exquisitaque doctrina philosophi Graeco sermone tractavissent',
          ],
        }];
      });

      test('text', () => {
        element.diff = {content};
        return element.render(keyLocations, prefs).then(() => {
          assert.isTrue(processStub.calledOnce);
          assert.isFalse(processStub.lastCall.args[1]);
        });
      });

      test('image', () => {
        element.diff = {content, binary: true};
        element.isImageDiff = true;
        return element.render(keyLocations, prefs).then(() => {
          assert.isTrue(processStub.calledOnce);
          assert.isTrue(processStub.lastCall.args[1]);
        });
      });

      test('binary', () => {
        element.diff = {content, binary: true};
        return element.render(keyLocations, prefs).then(() => {
          assert.isTrue(processStub.calledOnce);
          assert.isTrue(processStub.lastCall.args[1]);
        });
      });
    });

    suite('rendering', () => {
      let content;
      let outputEl;
      let keyLocations;

      setup(done => {
        const prefs = {
          line_length: 10,
          show_tabs: true,
          tab_size: 4,
          context: -1,
          syntax_highlighting: true,
        };
        content = [
          {
            a: ['all work and no play make andybons a dull boy'],
            b: ['elgoog elgoog elgoog'],
          },
          {
            ab: [
              'Non eram nescius, Brute, cum, quae summis ingeniis ',
              'exquisitaque doctrina philosophi Graeco sermone tractavissent',
            ],
          },
        ];
        stub('gr-reporting', {
          time: sandbox.stub(),
          timeEnd: sandbox.stub(),
        });
        element = fixture('basic');
        outputEl = element.queryEffectiveChildren('#diffTable');
        keyLocations = {left: {}, right: {}};
        sandbox.stub(element, '_getDiffBuilder', () => {
          const builder = new GrDiffBuilder({content}, prefs, outputEl);
          sandbox.stub(builder, 'addColumns');
          builder.buildSectionElement = function(group) {
            const section = document.createElement('stub');
            section.textContent = group.lines.reduce((acc, line) => {
              return acc + line.text;
            }, '');
            return section;
          };
          return builder;
        });
        element.diff = {content};
        element.render(keyLocations, prefs).then(done);
      });

      test('reporting', done => {
        const timeStub = element.$.reporting.time;
        const timeEndStub = element.$.reporting.timeEnd;
        assert.isTrue(timeStub.calledWithExactly('Diff Total Render'));
        assert.isTrue(timeStub.calledWithExactly('Diff Content Render'));
        assert.isTrue(timeStub.calledWithExactly('Diff Syntax Render'));
        assert.isTrue(timeEndStub.calledWithExactly('Diff Total Render'));
        assert.isTrue(timeEndStub.calledWithExactly('Diff Content Render'));
        assert.isTrue(timeEndStub.calledWithExactly('Diff Syntax Render'));
        done();
      });

      test('renderSection', () => {
        let section = outputEl.querySelector('stub:nth-of-type(2)');
        const prevInnerHTML = section.innerHTML;
        section.innerHTML = 'wiped';
        element._builder.renderSection(section);
        section = outputEl.querySelector('stub:nth-of-type(2)');
        assert.equal(section.innerHTML, prevInnerHTML);
      });

      test('addColumns is called', done => {
        element.render(keyLocations, {}).then(done);
        assert.isTrue(element._builder.addColumns.called);
      });

      test('getSectionsByLineRange one line', () => {
        const section = outputEl.querySelector('stub:nth-of-type(2)');
        const sections = element._builder.getSectionsByLineRange(1, 1, 'left');
        assert.equal(sections.length, 1);
        assert.strictEqual(sections[0], section);
      });

      test('getSectionsByLineRange over diff', () => {
        const section = [
          outputEl.querySelector('stub:nth-of-type(2)'),
          outputEl.querySelector('stub:nth-of-type(3)'),
        ];
        const sections = element._builder.getSectionsByLineRange(1, 2, 'left');
        assert.equal(sections.length, 2);
        assert.strictEqual(sections[0], section[0]);
        assert.strictEqual(sections[1], section[1]);
      });

      test('render-start and render are fired', done => {
        const dispatchEventStub = sandbox.stub(element, 'dispatchEvent');
        element.render(keyLocations, {}).then(() => {
          const firedEventTypes = dispatchEventStub.getCalls()
              .map(c => { return c.args[0].type; });
          assert.include(firedEventTypes, 'render-start');
          assert.include(firedEventTypes, 'render-content');
          assert.include(firedEventTypes, 'render');
          done();
        });
      });

      test('rendering normal-sized diff does not disable syntax', () => {
        assert.isTrue(element.$.syntaxLayer.enabled);
      });

      test('rendering large diff disables syntax', done => {
        // Before it renders, set the first diff line to 500 '*' characters.
        element.diff.content[0].a = [new Array(501).join('*')];
        element.addEventListener('render', () => {
          assert.isFalse(element.$.syntaxLayer.enabled);
          done();
        });
        const prefs = {
          line_length: 10,
          show_tabs: true,
          tab_size: 4,
          context: -1,
          syntax_highlighting: true,
        };
        element.render(keyLocations, prefs);
      });

      test('cancel', () => {
        const processorCancelStub = sandbox.stub(element.$.processor, 'cancel');
        const syntaxCancelStub = sandbox.stub(element.$.syntaxLayer, 'cancel');
        element.cancel();
        assert.isTrue(processorCancelStub.called);
        assert.isTrue(syntaxCancelStub.called);
      });
    });

    suite('mock-diff', () => {
      let element;
      let builder;
      let diff;
      let prefs;
      let keyLocations;

      setup(done => {
        element = fixture('mock-diff');
        diff = document.createElement('mock-diff-response').diffResponse;
        element.diff = diff;

        prefs = {
          line_length: 80,
          show_tabs: true,
          tab_size: 4,
        };
        keyLocations = {left: {}, right: {}};

        element.render(keyLocations, prefs).then(() => {
          builder = element._builder;
          done();
        });
      });

      test('getDiffLength', () => {
        assert.equal(element.getDiffLength(diff), 52);
      });

      test('getContentByLine', () => {
        let actual;

        actual = builder.getContentByLine(2, 'left');
        assert.equal(actual.textContent, diff.content[0].ab[1]);

        actual = builder.getContentByLine(2, 'right');
        assert.equal(actual.textContent, diff.content[0].ab[1]);

        actual = builder.getContentByLine(5, 'left');
        assert.equal(actual.textContent, diff.content[2].ab[0]);

        actual = builder.getContentByLine(5, 'right');
        assert.equal(actual.textContent, diff.content[1].b[0]);
      });

      test('findLinesByRange', () => {
        const lines = [];
        const elems = [];
        const start = 6;
        const end = 10;
        const count = end - start + 1;

        builder.findLinesByRange(start, end, 'right', lines, elems);

        assert.equal(lines.length, count);
        assert.equal(elems.length, count);

        for (let i = 0; i < 5; i++) {
          assert.instanceOf(lines[i], GrDiffLine);
          assert.equal(lines[i].afterNumber, start + i);
          assert.instanceOf(elems[i], HTMLElement);
          assert.equal(lines[i].text, elems[i].textContent);
        }
      });

      test('_renderContentByRange', () => {
        const spy = sandbox.spy(builder, '_createTextEl');
        const start = 9;
        const end = 14;
        const count = end - start + 1;

        builder._renderContentByRange(start, end, 'left');

        assert.equal(spy.callCount, count);
        spy.getCalls().forEach((call, i) => {
          assert.equal(call.args[1].beforeNumber, start + i);
        });
      });

      test('_renderContentByRange notexistent elements', () => {
        const spy = sandbox.spy(builder, '_createTextEl');

        sandbox.stub(builder, 'findLinesByRange',
            (s, e, d, lines, elements) => {
              // Add a line and a corresponding element.
              lines.push(new GrDiffLine(GrDiffLine.Type.BOTH));
              const tr = document.createElement('tr');
              const td = document.createElement('td');
              const el = document.createElement('div');
              tr.appendChild(td);
              td.appendChild(el);
              elements.push(el);

              // Add 2 lines without corresponding elements.
              lines.push(new GrDiffLine(GrDiffLine.Type.BOTH));
              lines.push(new GrDiffLine(GrDiffLine.Type.BOTH));
            });

        builder._renderContentByRange(1, 10, 'left');
        // Should be called only once because only one line had a corresponding
        // element.
        assert.equal(spy.callCount, 1);
      });

      test('_getLineNumberEl side-by-side left', () => {
        const contentEl = builder.getContentByLine(5, 'left',
            element.$.diffTable);
        const lineNumberEl = builder._getLineNumberEl(contentEl, 'left');
        assert.isTrue(lineNumberEl.classList.contains('lineNum'));
        assert.isTrue(lineNumberEl.classList.contains('left'));
      });

      test('_getLineNumberEl side-by-side right', () => {
        const contentEl = builder.getContentByLine(5, 'right',
            element.$.diffTable);
        const lineNumberEl = builder._getLineNumberEl(contentEl, 'right');
        assert.isTrue(lineNumberEl.classList.contains('lineNum'));
        assert.isTrue(lineNumberEl.classList.contains('right'));
      });

      test('_getLineNumberEl unified left', done => {
        // Re-render as unified:
        element.viewMode = 'UNIFIED_DIFF';
        element.render(keyLocations, prefs).then(() => {
          builder = element._builder;

          const contentEl = builder.getContentByLine(5, 'left',
              element.$.diffTable);
          const lineNumberEl = builder._getLineNumberEl(contentEl, 'left');
          assert.isTrue(lineNumberEl.classList.contains('lineNum'));
          assert.isTrue(lineNumberEl.classList.contains('left'));
          done();
        });
      });

      test('_getLineNumberEl unified right', done => {
        // Re-render as unified:
        element.viewMode = 'UNIFIED_DIFF';
        element.render(keyLocations, prefs).then(() => {
          builder = element._builder;

          const contentEl = builder.getContentByLine(5, 'right',
              element.$.diffTable);
          const lineNumberEl = builder._getLineNumberEl(contentEl, 'right');
          assert.isTrue(lineNumberEl.classList.contains('lineNum'));
          assert.isTrue(lineNumberEl.classList.contains('right'));
          done();
        });
      });

      test('_getNextContentOnSide side-by-side left', () => {
        const startElem = builder.getContentByLine(5, 'left',
            element.$.diffTable);
        const expectedStartString = diff.content[2].ab[0];
        const expectedNextString = diff.content[2].ab[1];
        assert.equal(startElem.textContent, expectedStartString);

        const nextElem = builder._getNextContentOnSide(startElem,
            'left');
        assert.equal(nextElem.textContent, expectedNextString);
      });

      test('_getNextContentOnSide side-by-side right', () => {
        const startElem = builder.getContentByLine(5, 'right',
            element.$.diffTable);
        const expectedStartString = diff.content[1].b[0];
        const expectedNextString = diff.content[1].b[1];
        assert.equal(startElem.textContent, expectedStartString);

        const nextElem = builder._getNextContentOnSide(startElem,
            'right');
        assert.equal(nextElem.textContent, expectedNextString);
      });

      test('_getNextContentOnSide unified left', done => {
        // Re-render as unified:
        element.viewMode = 'UNIFIED_DIFF';
        element.render(keyLocations, prefs).then(() => {
          builder = element._builder;

          const startElem = builder.getContentByLine(5, 'left',
              element.$.diffTable);
          const expectedStartString = diff.content[2].ab[0];
          const expectedNextString = diff.content[2].ab[1];
          assert.equal(startElem.textContent, expectedStartString);

          const nextElem = builder._getNextContentOnSide(startElem,
              'left');
          assert.equal(nextElem.textContent, expectedNextString);

          done();
        });
      });

      test('_getNextContentOnSide unified right', done => {
        // Re-render as unified:
        element.viewMode = 'UNIFIED_DIFF';
        element.render(keyLocations, prefs).then(() => {
          builder = element._builder;

          const startElem = builder.getContentByLine(5, 'right',
              element.$.diffTable);
          const expectedStartString = diff.content[1].b[0];
          const expectedNextString = diff.content[1].b[1];
          assert.equal(startElem.textContent, expectedStartString);

          const nextElem = builder._getNextContentOnSide(startElem,
              'right');
          assert.equal(nextElem.textContent, expectedNextString);

          done();
        });
      });

      test('escaping HTML', () => {
        let input = '<script>alert("XSS");<' + '/script>';
        let expected = '&lt;script&gt;alert("XSS");&lt;/script&gt;';
        let result = builder._formatText(input, 1, Infinity).innerHTML;
        assert.equal(result, expected);

        input = '& < > " \' / `';
        expected = '&amp; &lt; &gt; " \' / `';
        result = builder._formatText(input, 1, Infinity).innerHTML;
        assert.equal(result, expected);
      });
    });

    suite('blame', () => {
      let mockBlame;

      setup(() => {
        mockBlame = [
          {id: 'commit 1', ranges: [{start: 1, end: 2}, {start: 10, end: 16}]},
          {id: 'commit 2', ranges: [{start: 4, end: 10}, {start: 17, end: 32}]},
        ];
      });

      test('setBlame attempts to render each blamed line', () => {
        const getBlameStub = sandbox.stub(builder, '_getBlameByLineNum')
            .returns(null);
        builder.setBlame(mockBlame);
        assert.equal(getBlameStub.callCount, 32);
      });

      test('_getBlameCommitForBaseLine', () => {
        builder.setBlame(mockBlame);
        assert.isOk(builder._getBlameCommitForBaseLine(1));
        assert.equal(builder._getBlameCommitForBaseLine(1).id, 'commit 1');

        assert.isOk(builder._getBlameCommitForBaseLine(11));
        assert.equal(builder._getBlameCommitForBaseLine(11).id, 'commit 1');

        assert.isOk(builder._getBlameCommitForBaseLine(32));
        assert.equal(builder._getBlameCommitForBaseLine(32).id, 'commit 2');

        assert.isNull(builder._getBlameCommitForBaseLine(33));
      });

      test('_getBlameCommitForBaseLine w/o blame returns null', () => {
        assert.isNull(builder._getBlameCommitForBaseLine(1));
        assert.isNull(builder._getBlameCommitForBaseLine(11));
        assert.isNull(builder._getBlameCommitForBaseLine(31));
      });

      test('_createBlameCell', () => {
        const mocbBlameCell = document.createElement('span');
        const getBlameStub = sinon.stub(builder, '_getBlameForBaseLine')
            .returns(mocbBlameCell);
        const line = new GrDiffLine(GrDiffLine.Type.BOTH);
        line.beforeNumber = 3;
        line.afterNumber = 5;

        const result = builder._createBlameCell(line);

        assert.isTrue(getBlameStub.calledWithExactly(3));
        assert.equal(result.getAttribute('data-line-number'), '3');
        assert.equal(result.firstChild, mocbBlameCell);
      });
    });
  });
</script>
